r600: Fix get_work_dim range metadata

Reviewed-by: Matt Arsenault <Matthew.Arsenault@amd.com>
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>

git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@220388 91177308-0d34-0410-b5e6-96231b3b80d8